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CommitLineData
1da177e4
LT
1/*
2 * Event char devices, giving access to raw input device events.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 */
10
da0c4901
JP
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
1da177e4
LT
13#define EVDEV_MINOR_BASE 64
14#define EVDEV_MINORS 32
63a6404d
HR
15#define EVDEV_MIN_BUFFER_SIZE 64U
16#define EVDEV_BUF_PACKETS 8
1da177e4
LT
17
18#include <linux/poll.h>
a99bbaf5 19#include <linux/sched.h>
1da177e4
LT
20#include <linux/slab.h>
21#include <linux/module.h>
22#include <linux/init.h>
1cf0c6e6 23#include <linux/input/mt.h>
1da177e4 24#include <linux/major.h>
1da177e4 25#include <linux/device.h>
2d56f3a3 26#include "input-compat.h"
1da177e4
LT
27
28struct evdev {
1da177e4
LT
29 int open;
30 int minor;
1da177e4
LT
31 struct input_handle handle;
32 wait_queue_head_t wait;
2be85279 33 struct evdev_client __rcu *grab;
d0ffb9be 34 struct list_head client_list;
6addb1d6
DT
35 spinlock_t client_lock; /* protects client_list */
36 struct mutex mutex;
9657d75c 37 struct device dev;
20da92de 38 bool exist;
1da177e4
LT
39};
40
d0ffb9be 41struct evdev_client {
9fb0f14e
JB
42 unsigned int head;
43 unsigned int tail;
cdda911c 44 unsigned int packet_head; /* [future] position of the first element of next packet */
6addb1d6 45 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
1da177e4
LT
46 struct fasync_struct *fasync;
47 struct evdev *evdev;
48 struct list_head node;
a80b83b7 49 int clkid;
9fb0f14e 50 unsigned int bufsize;
b58f7086 51 struct input_event buffer[];
1da177e4
LT
52};
53
54static struct evdev *evdev_table[EVDEV_MINORS];
6addb1d6 55static DEFINE_MUTEX(evdev_table_mutex);
1da177e4 56
6addb1d6 57static void evdev_pass_event(struct evdev_client *client,
a80b83b7
JS
58 struct input_event *event,
59 ktime_t mono, ktime_t real)
6addb1d6 60{
a80b83b7
JS
61 event->time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
62 mono : real);
63
9fb0f14e 64 /* Interrupts are disabled, just acquire the lock. */
6addb1d6 65 spin_lock(&client->buffer_lock);
9fb0f14e
JB
66
67 client->buffer[client->head++] = *event;
68 client->head &= client->bufsize - 1;
69
70 if (unlikely(client->head == client->tail)) {
71 /*
72 * This effectively "drops" all unconsumed events, leaving
73 * EV_SYN/SYN_DROPPED plus the newest event in the queue.
74 */
75 client->tail = (client->head - 2) & (client->bufsize - 1);
76
77 client->buffer[client->tail].time = event->time;
78 client->buffer[client->tail].type = EV_SYN;
79 client->buffer[client->tail].code = SYN_DROPPED;
80 client->buffer[client->tail].value = 0;
9fb0f14e 81
cdda911c
JB
82 client->packet_head = client->tail;
83 }
6addb1d6 84
cdda911c
JB
85 if (event->type == EV_SYN && event->code == SYN_REPORT) {
86 client->packet_head = client->head;
30a589fd 87 kill_fasync(&client->fasync, SIGIO, POLL_IN);
cdda911c
JB
88 }
89
90 spin_unlock(&client->buffer_lock);
6addb1d6
DT
91}
92
93/*
82ba56c2 94 * Pass incoming event to all connected clients.
6addb1d6
DT
95 */
96static void evdev_event(struct input_handle *handle,
97 unsigned int type, unsigned int code, int value)
1da177e4
LT
98{
99 struct evdev *evdev = handle->private;
d0ffb9be 100 struct evdev_client *client;
6addb1d6 101 struct input_event event;
a80b83b7
JS
102 ktime_t time_mono, time_real;
103
104 time_mono = ktime_get();
105 time_real = ktime_sub(time_mono, ktime_get_monotonic_offset());
1da177e4 106
6addb1d6
DT
107 event.type = type;
108 event.code = code;
109 event.value = value;
1da177e4 110
82ba56c2
DT
111 rcu_read_lock();
112
6addb1d6 113 client = rcu_dereference(evdev->grab);
a80b83b7 114
6addb1d6 115 if (client)
a80b83b7 116 evdev_pass_event(client, &event, time_mono, time_real);
6addb1d6
DT
117 else
118 list_for_each_entry_rcu(client, &evdev->client_list, node)
a80b83b7 119 evdev_pass_event(client, &event, time_mono, time_real);
1da177e4 120
82ba56c2
DT
121 rcu_read_unlock();
122
da40b0b6
DT
123 if (type == EV_SYN && code == SYN_REPORT)
124 wake_up_interruptible(&evdev->wait);
1da177e4
LT
125}
126
127static int evdev_fasync(int fd, struct file *file, int on)
128{
d0ffb9be 129 struct evdev_client *client = file->private_data;
1e0afb28 130
60aa4924 131 return fasync_helper(fd, file, on, &client->fasync);
1da177e4
LT
132}
133
1e0afb28 134static int evdev_flush(struct file *file, fl_owner_t id)
1da177e4 135{
d0ffb9be
DT
136 struct evdev_client *client = file->private_data;
137 struct evdev *evdev = client->evdev;
6addb1d6
DT
138 int retval;
139
140 retval = mutex_lock_interruptible(&evdev->mutex);
141 if (retval)
142 return retval;
1e0afb28 143
d0ffb9be 144 if (!evdev->exist)
6addb1d6
DT
145 retval = -ENODEV;
146 else
147 retval = input_flush_device(&evdev->handle, file);
1e0afb28 148
6addb1d6
DT
149 mutex_unlock(&evdev->mutex);
150 return retval;
1da177e4
LT
151}
152
9657d75c 153static void evdev_free(struct device *dev)
1da177e4 154{
9657d75c
DT
155 struct evdev *evdev = container_of(dev, struct evdev, dev);
156
a7097ff8 157 input_put_device(evdev->handle.dev);
1da177e4
LT
158 kfree(evdev);
159}
160
6addb1d6
DT
161/*
162 * Grabs an event device (along with underlying input device).
163 * This function is called with evdev->mutex taken.
164 */
165static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
166{
167 int error;
168
169 if (evdev->grab)
170 return -EBUSY;
171
172 error = input_grab_device(&evdev->handle);
173 if (error)
174 return error;
175
176 rcu_assign_pointer(evdev->grab, client);
6addb1d6
DT
177
178 return 0;
179}
180
181static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
182{
183 if (evdev->grab != client)
184 return -EINVAL;
185
186 rcu_assign_pointer(evdev->grab, NULL);
82ba56c2 187 synchronize_rcu();
6addb1d6
DT
188 input_release_device(&evdev->handle);
189
190 return 0;
191}
192
193static void evdev_attach_client(struct evdev *evdev,
194 struct evdev_client *client)
195{
196 spin_lock(&evdev->client_lock);
197 list_add_tail_rcu(&client->node, &evdev->client_list);
198 spin_unlock(&evdev->client_lock);
6addb1d6
DT
199}
200
201static void evdev_detach_client(struct evdev *evdev,
202 struct evdev_client *client)
203{
204 spin_lock(&evdev->client_lock);
205 list_del_rcu(&client->node);
206 spin_unlock(&evdev->client_lock);
82ba56c2 207 synchronize_rcu();
6addb1d6
DT
208}
209
210static int evdev_open_device(struct evdev *evdev)
211{
212 int retval;
213
214 retval = mutex_lock_interruptible(&evdev->mutex);
215 if (retval)
216 return retval;
217
218 if (!evdev->exist)
219 retval = -ENODEV;
06445014 220 else if (!evdev->open++) {
6addb1d6 221 retval = input_open_device(&evdev->handle);
06445014
ON
222 if (retval)
223 evdev->open--;
224 }
6addb1d6
DT
225
226 mutex_unlock(&evdev->mutex);
227 return retval;
228}
229
230static void evdev_close_device(struct evdev *evdev)
231{
232 mutex_lock(&evdev->mutex);
233
234 if (evdev->exist && !--evdev->open)
235 input_close_device(&evdev->handle);
236
237 mutex_unlock(&evdev->mutex);
238}
239
240/*
241 * Wake up users waiting for IO so they can disconnect from
242 * dead device.
243 */
244static void evdev_hangup(struct evdev *evdev)
245{
246 struct evdev_client *client;
247
248 spin_lock(&evdev->client_lock);
249 list_for_each_entry(client, &evdev->client_list, node)
250 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
251 spin_unlock(&evdev->client_lock);
252
253 wake_up_interruptible(&evdev->wait);
254}
255
d0ffb9be 256static int evdev_release(struct inode *inode, struct file *file)
1da177e4 257{
d0ffb9be
DT
258 struct evdev_client *client = file->private_data;
259 struct evdev *evdev = client->evdev;
1da177e4 260
6addb1d6
DT
261 mutex_lock(&evdev->mutex);
262 if (evdev->grab == client)
263 evdev_ungrab(evdev, client);
264 mutex_unlock(&evdev->mutex);
1da177e4 265
6addb1d6 266 evdev_detach_client(evdev, client);
d0ffb9be 267 kfree(client);
1da177e4 268
6addb1d6 269 evdev_close_device(evdev);
9657d75c 270 put_device(&evdev->dev);
1da177e4 271
1da177e4
LT
272 return 0;
273}
274
b58f7086
HR
275static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
276{
63a6404d
HR
277 unsigned int n_events =
278 max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
279 EVDEV_MIN_BUFFER_SIZE);
280
281 return roundup_pow_of_two(n_events);
b58f7086
HR
282}
283
d0ffb9be 284static int evdev_open(struct inode *inode, struct file *file)
1da177e4 285{
d0ffb9be 286 struct evdev *evdev;
6addb1d6 287 struct evdev_client *client;
1da177e4 288 int i = iminor(inode) - EVDEV_MINOR_BASE;
b58f7086 289 unsigned int bufsize;
d542ed82 290 int error;
1da177e4 291
d0ffb9be 292 if (i >= EVDEV_MINORS)
1da177e4
LT
293 return -ENODEV;
294
6addb1d6
DT
295 error = mutex_lock_interruptible(&evdev_table_mutex);
296 if (error)
297 return error;
d0ffb9be 298 evdev = evdev_table[i];
6addb1d6
DT
299 if (evdev)
300 get_device(&evdev->dev);
301 mutex_unlock(&evdev_table_mutex);
d0ffb9be 302
6addb1d6 303 if (!evdev)
1da177e4
LT
304 return -ENODEV;
305
b58f7086
HR
306 bufsize = evdev_compute_buffer_size(evdev->handle.dev);
307
308 client = kzalloc(sizeof(struct evdev_client) +
309 bufsize * sizeof(struct input_event),
310 GFP_KERNEL);
9657d75c
DT
311 if (!client) {
312 error = -ENOMEM;
313 goto err_put_evdev;
314 }
1da177e4 315
b58f7086 316 client->bufsize = bufsize;
6addb1d6 317 spin_lock_init(&client->buffer_lock);
d0ffb9be 318 client->evdev = evdev;
6addb1d6 319 evdev_attach_client(evdev, client);
1da177e4 320
6addb1d6
DT
321 error = evdev_open_device(evdev);
322 if (error)
323 goto err_free_client;
1da177e4 324
d0ffb9be 325 file->private_data = client;
3d7bbd45
DT
326 nonseekable_open(inode, file);
327
1da177e4 328 return 0;
9657d75c
DT
329
330 err_free_client:
6addb1d6 331 evdev_detach_client(evdev, client);
9657d75c
DT
332 kfree(client);
333 err_put_evdev:
334 put_device(&evdev->dev);
335 return error;
1da177e4
LT
336}
337
6addb1d6
DT
338static ssize_t evdev_write(struct file *file, const char __user *buffer,
339 size_t count, loff_t *ppos)
3a51f7c4 340{
d0ffb9be
DT
341 struct evdev_client *client = file->private_data;
342 struct evdev *evdev = client->evdev;
3a51f7c4 343 struct input_event event;
02dfc496 344 int retval = 0;
52658bb6 345
439581ec
PK
346 if (count < input_event_size())
347 return -EINVAL;
348
6addb1d6
DT
349 retval = mutex_lock_interruptible(&evdev->mutex);
350 if (retval)
351 return retval;
352
353 if (!evdev->exist) {
354 retval = -ENODEV;
355 goto out;
356 }
52658bb6 357
439581ec 358 do {
2d56f3a3 359 if (input_event_from_user(buffer + retval, &event)) {
6addb1d6
DT
360 retval = -EFAULT;
361 goto out;
362 }
439581ec 363 retval += input_event_size();
6addb1d6
DT
364
365 input_inject_event(&evdev->handle,
366 event.type, event.code, event.value);
439581ec 367 } while (retval + input_event_size() <= count);
52658bb6 368
6addb1d6
DT
369 out:
370 mutex_unlock(&evdev->mutex);
52658bb6
JK
371 return retval;
372}
52658bb6 373
6addb1d6
DT
374static int evdev_fetch_next_event(struct evdev_client *client,
375 struct input_event *event)
376{
377 int have_event;
378
379 spin_lock_irq(&client->buffer_lock);
380
566cf5b6 381 have_event = client->packet_head != client->tail;
6addb1d6
DT
382 if (have_event) {
383 *event = client->buffer[client->tail++];
b58f7086 384 client->tail &= client->bufsize - 1;
6addb1d6
DT
385 }
386
387 spin_unlock_irq(&client->buffer_lock);
388
389 return have_event;
390}
391
392static ssize_t evdev_read(struct file *file, char __user *buffer,
393 size_t count, loff_t *ppos)
1da177e4 394{
d0ffb9be
DT
395 struct evdev_client *client = file->private_data;
396 struct evdev *evdev = client->evdev;
6addb1d6 397 struct input_event event;
42f57874 398 int retval = 0;
1da177e4 399
2d56f3a3 400 if (count < input_event_size())
1da177e4
LT
401 return -EINVAL;
402
509f87c5
DZ
403 if (!(file->f_flags & O_NONBLOCK)) {
404 retval = wait_event_interruptible(evdev->wait,
405 client->packet_head != client->tail ||
406 !evdev->exist);
407 if (retval)
408 return retval;
409 }
1da177e4 410
d0ffb9be 411 if (!evdev->exist)
1da177e4
LT
412 return -ENODEV;
413
2d56f3a3 414 while (retval + input_event_size() <= count &&
6addb1d6 415 evdev_fetch_next_event(client, &event)) {
3a51f7c4 416
2d56f3a3 417 if (input_event_to_user(buffer + retval, &event))
3a51f7c4
DT
418 return -EFAULT;
419
2d56f3a3 420 retval += input_event_size();
1da177e4
LT
421 }
422
e90f869c
DZ
423 if (retval == 0 && (file->f_flags & O_NONBLOCK))
424 return -EAGAIN;
425
1da177e4
LT
426 return retval;
427}
428
429/* No kernel lock - fine */
430static unsigned int evdev_poll(struct file *file, poll_table *wait)
431{
d0ffb9be
DT
432 struct evdev_client *client = file->private_data;
433 struct evdev *evdev = client->evdev;
c18fb139 434 unsigned int mask;
1e0afb28 435
d0ffb9be 436 poll_wait(file, &evdev->wait, wait);
c18fb139
DT
437
438 mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
cdda911c 439 if (client->packet_head != client->tail)
c18fb139
DT
440 mask |= POLLIN | POLLRDNORM;
441
442 return mask;
1da177e4
LT
443}
444
3a51f7c4
DT
445#ifdef CONFIG_COMPAT
446
447#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
7b19ada2 448#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
3a51f7c4
DT
449
450#ifdef __BIG_ENDIAN
451static int bits_to_user(unsigned long *bits, unsigned int maxbit,
452 unsigned int maxlen, void __user *p, int compat)
453{
454 int len, i;
455
456 if (compat) {
7b19ada2 457 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
bf61f8d3 458 if (len > maxlen)
3a51f7c4
DT
459 len = maxlen;
460
461 for (i = 0; i < len / sizeof(compat_long_t); i++)
462 if (copy_to_user((compat_long_t __user *) p + i,
463 (compat_long_t *) bits +
464 i + 1 - ((i % 2) << 1),
465 sizeof(compat_long_t)))
466 return -EFAULT;
467 } else {
7b19ada2 468 len = BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
469 if (len > maxlen)
470 len = maxlen;
471
472 if (copy_to_user(p, bits, len))
473 return -EFAULT;
474 }
475
476 return len;
477}
478#else
479static int bits_to_user(unsigned long *bits, unsigned int maxbit,
480 unsigned int maxlen, void __user *p, int compat)
481{
482 int len = compat ?
7b19ada2
JS
483 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
484 BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
485
486 if (len > maxlen)
487 len = maxlen;
488
489 return copy_to_user(p, bits, len) ? -EFAULT : len;
490}
491#endif /* __BIG_ENDIAN */
492
493#else
494
495static int bits_to_user(unsigned long *bits, unsigned int maxbit,
496 unsigned int maxlen, void __user *p, int compat)
497{
7b19ada2 498 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
499
500 if (len > maxlen)
501 len = maxlen;
502
503 return copy_to_user(p, bits, len) ? -EFAULT : len;
504}
505
506#endif /* CONFIG_COMPAT */
507
508static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
509{
510 int len;
511
512 if (!str)
513 return -ENOENT;
514
515 len = strlen(str) + 1;
516 if (len > maxlen)
517 len = maxlen;
518
519 return copy_to_user(p, str, len) ? -EFAULT : len;
520}
521
f2afa771 522#define OLD_KEY_MAX 0x1ff
448cd166
DT
523static int handle_eviocgbit(struct input_dev *dev,
524 unsigned int type, unsigned int size,
525 void __user *p, int compat_mode)
5402a734 526{
f2afa771 527 static unsigned long keymax_warn_time;
5402a734
LT
528 unsigned long *bits;
529 int len;
530
448cd166 531 switch (type) {
5402a734
LT
532
533 case 0: bits = dev->evbit; len = EV_MAX; break;
534 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
535 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
536 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
537 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
538 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
539 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
540 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
541 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
542 default: return -EINVAL;
543 }
f2afa771
DT
544
545 /*
546 * Work around bugs in userspace programs that like to do
547 * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
548 * should be in bytes, not in bits.
549 */
448cd166 550 if (type == EV_KEY && size == OLD_KEY_MAX) {
f2afa771
DT
551 len = OLD_KEY_MAX;
552 if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
da0c4901
JP
553 pr_warning("(EVIOCGBIT): Suspicious buffer size %u, "
554 "limiting output to %zu bytes. See "
555 "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
556 OLD_KEY_MAX,
557 BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
f2afa771
DT
558 }
559
448cd166 560 return bits_to_user(bits, len, size, p, compat_mode);
5402a734 561}
f2afa771 562#undef OLD_KEY_MAX
5402a734 563
ab4e0192 564static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
8613e4c2 565{
ab4e0192
DT
566 struct input_keymap_entry ke = {
567 .len = sizeof(unsigned int),
568 .flags = 0,
569 };
570 int __user *ip = (int __user *)p;
8613e4c2
MCC
571 int error;
572
ab4e0192
DT
573 /* legacy case */
574 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
575 return -EFAULT;
8613e4c2 576
ab4e0192
DT
577 error = input_get_keycode(dev, &ke);
578 if (error)
579 return error;
8613e4c2 580
ab4e0192
DT
581 if (put_user(ke.keycode, ip + 1))
582 return -EFAULT;
8613e4c2 583
ab4e0192
DT
584 return 0;
585}
8613e4c2 586
ab4e0192
DT
587static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
588{
589 struct input_keymap_entry ke;
590 int error;
8613e4c2 591
ab4e0192
DT
592 if (copy_from_user(&ke, p, sizeof(ke)))
593 return -EFAULT;
8613e4c2 594
ab4e0192
DT
595 error = input_get_keycode(dev, &ke);
596 if (error)
597 return error;
8613e4c2 598
ab4e0192
DT
599 if (copy_to_user(p, &ke, sizeof(ke)))
600 return -EFAULT;
8613e4c2 601
8613e4c2
MCC
602 return 0;
603}
604
ab4e0192 605static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
8613e4c2 606{
ab4e0192
DT
607 struct input_keymap_entry ke = {
608 .len = sizeof(unsigned int),
609 .flags = 0,
610 };
611 int __user *ip = (int __user *)p;
8613e4c2 612
ab4e0192
DT
613 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
614 return -EFAULT;
8613e4c2 615
ab4e0192
DT
616 if (get_user(ke.keycode, ip + 1))
617 return -EFAULT;
8613e4c2 618
ab4e0192
DT
619 return input_set_keycode(dev, &ke);
620}
8613e4c2 621
ab4e0192
DT
622static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
623{
624 struct input_keymap_entry ke;
8613e4c2 625
ab4e0192
DT
626 if (copy_from_user(&ke, p, sizeof(ke)))
627 return -EFAULT;
8613e4c2 628
ab4e0192
DT
629 if (ke.len > sizeof(ke.scancode))
630 return -EINVAL;
8613e4c2
MCC
631
632 return input_set_keycode(dev, &ke);
633}
634
1cf0c6e6
HR
635static int evdev_handle_mt_request(struct input_dev *dev,
636 unsigned int size,
637 int __user *ip)
638{
639 const struct input_mt_slot *mt = dev->mt;
640 unsigned int code;
641 int max_slots;
642 int i;
643
644 if (get_user(code, &ip[0]))
645 return -EFAULT;
646 if (!input_is_mt_value(code))
647 return -EINVAL;
648
649 max_slots = (size - sizeof(__u32)) / sizeof(__s32);
650 for (i = 0; i < dev->mtsize && i < max_slots; i++)
651 if (put_user(input_mt_get_value(&mt[i], code), &ip[1 + i]))
652 return -EFAULT;
653
654 return 0;
655}
656
6addb1d6
DT
657static long evdev_do_ioctl(struct file *file, unsigned int cmd,
658 void __user *p, int compat_mode)
1da177e4 659{
d0ffb9be
DT
660 struct evdev_client *client = file->private_data;
661 struct evdev *evdev = client->evdev;
1da177e4
LT
662 struct input_dev *dev = evdev->handle.dev;
663 struct input_absinfo abs;
509ca1a9 664 struct ff_effect effect;
3a51f7c4 665 int __user *ip = (int __user *)p;
58b93995 666 unsigned int i, t, u, v;
448cd166 667 unsigned int size;
509ca1a9 668 int error;
1da177e4 669
448cd166 670 /* First we check for fixed-length commands */
1da177e4
LT
671 switch (cmd) {
672
6addb1d6
DT
673 case EVIOCGVERSION:
674 return put_user(EV_VERSION, ip);
1da177e4 675
6addb1d6
DT
676 case EVIOCGID:
677 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
678 return -EFAULT;
679 return 0;
08791e5c 680
6addb1d6
DT
681 case EVIOCGREP:
682 if (!test_bit(EV_REP, dev->evbit))
683 return -ENOSYS;
684 if (put_user(dev->rep[REP_DELAY], ip))
685 return -EFAULT;
686 if (put_user(dev->rep[REP_PERIOD], ip + 1))
687 return -EFAULT;
688 return 0;
08791e5c 689
6addb1d6
DT
690 case EVIOCSREP:
691 if (!test_bit(EV_REP, dev->evbit))
692 return -ENOSYS;
693 if (get_user(u, ip))
694 return -EFAULT;
695 if (get_user(v, ip + 1))
696 return -EFAULT;
08791e5c 697
6addb1d6
DT
698 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
699 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
3a51f7c4 700
6addb1d6 701 return 0;
1da177e4 702
6addb1d6
DT
703 case EVIOCRMFF:
704 return input_ff_erase(dev, (int)(unsigned long) p, file);
1da177e4 705
6addb1d6
DT
706 case EVIOCGEFFECTS:
707 i = test_bit(EV_FF, dev->evbit) ?
708 dev->ff->max_effects : 0;
709 if (put_user(i, ip))
710 return -EFAULT;
711 return 0;
712
713 case EVIOCGRAB:
714 if (p)
715 return evdev_grab(evdev, client);
716 else
717 return evdev_ungrab(evdev, client);
ab4e0192 718
a80b83b7
JS
719 case EVIOCSCLOCKID:
720 if (copy_from_user(&i, p, sizeof(unsigned int)))
721 return -EFAULT;
722 if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME)
723 return -EINVAL;
724 client->clkid = i;
725 return 0;
726
ab4e0192
DT
727 case EVIOCGKEYCODE:
728 return evdev_handle_get_keycode(dev, p);
729
730 case EVIOCSKEYCODE:
731 return evdev_handle_set_keycode(dev, p);
732
733 case EVIOCGKEYCODE_V2:
734 return evdev_handle_get_keycode_v2(dev, p);
735
736 case EVIOCSKEYCODE_V2:
737 return evdev_handle_set_keycode_v2(dev, p);
448cd166 738 }
1da177e4 739
448cd166 740 size = _IOC_SIZE(cmd);
1da177e4 741
448cd166
DT
742 /* Now check variable-length commands */
743#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
448cd166 744 switch (EVIOC_MASK_SIZE(cmd)) {
41e979f8 745
85b77200
HR
746 case EVIOCGPROP(0):
747 return bits_to_user(dev->propbit, INPUT_PROP_MAX,
748 size, p, compat_mode);
749
1cf0c6e6
HR
750 case EVIOCGMTSLOTS(0):
751 return evdev_handle_mt_request(dev, size, ip);
752
448cd166
DT
753 case EVIOCGKEY(0):
754 return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode);
1da177e4 755
448cd166
DT
756 case EVIOCGLED(0):
757 return bits_to_user(dev->led, LED_MAX, size, p, compat_mode);
1da177e4 758
448cd166
DT
759 case EVIOCGSND(0):
760 return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode);
1da177e4 761
448cd166
DT
762 case EVIOCGSW(0):
763 return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode);
31581066 764
448cd166
DT
765 case EVIOCGNAME(0):
766 return str_to_user(dev->name, size, p);
1da177e4 767
448cd166
DT
768 case EVIOCGPHYS(0):
769 return str_to_user(dev->phys, size, p);
1da177e4 770
448cd166
DT
771 case EVIOCGUNIQ(0):
772 return str_to_user(dev->uniq, size, p);
1da177e4 773
448cd166
DT
774 case EVIOC_MASK_SIZE(EVIOCSFF):
775 if (input_ff_effect_from_user(p, size, &effect))
776 return -EFAULT;
1da177e4 777
448cd166 778 error = input_ff_upload(dev, &effect, file);
1da177e4 779
448cd166
DT
780 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
781 return -EFAULT;
41e979f8 782
448cd166
DT
783 return error;
784 }
1da177e4 785
448cd166
DT
786 /* Multi-number variable-length handlers */
787 if (_IOC_TYPE(cmd) != 'E')
788 return -EINVAL;
1da177e4 789
448cd166 790 if (_IOC_DIR(cmd) == _IOC_READ) {
6addb1d6 791
448cd166
DT
792 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
793 return handle_eviocgbit(dev,
794 _IOC_NR(cmd) & EV_MAX, size,
795 p, compat_mode);
1da177e4 796
448cd166 797 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
f2278f31 798
0a74a1df
DM
799 if (!dev->absinfo)
800 return -EINVAL;
801
448cd166
DT
802 t = _IOC_NR(cmd) & ABS_MAX;
803 abs = dev->absinfo[t];
f2278f31 804
448cd166
DT
805 if (copy_to_user(p, &abs, min_t(size_t,
806 size, sizeof(struct input_absinfo))))
807 return -EFAULT;
f2278f31 808
448cd166
DT
809 return 0;
810 }
811 }
f2278f31 812
f9ce6eb5 813 if (_IOC_DIR(cmd) == _IOC_WRITE) {
f2278f31 814
448cd166 815 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
1da177e4 816
0a74a1df
DM
817 if (!dev->absinfo)
818 return -EINVAL;
819
448cd166 820 t = _IOC_NR(cmd) & ABS_MAX;
41e979f8 821
448cd166
DT
822 if (copy_from_user(&abs, p, min_t(size_t,
823 size, sizeof(struct input_absinfo))))
824 return -EFAULT;
1da177e4 825
448cd166
DT
826 if (size < sizeof(struct input_absinfo))
827 abs.resolution = 0;
d31b2865 828
448cd166
DT
829 /* We can't change number of reserved MT slots */
830 if (t == ABS_MT_SLOT)
831 return -EINVAL;
40d007e7 832
448cd166
DT
833 /*
834 * Take event lock to ensure that we are not
835 * changing device parameters in the middle
836 * of event.
837 */
838 spin_lock_irq(&dev->event_lock);
839 dev->absinfo[t] = abs;
840 spin_unlock_irq(&dev->event_lock);
6addb1d6 841
448cd166 842 return 0;
6addb1d6 843 }
1da177e4 844 }
448cd166 845
1da177e4
LT
846 return -EINVAL;
847}
1da177e4 848
6addb1d6
DT
849static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
850 void __user *p, int compat_mode)
851{
852 struct evdev_client *client = file->private_data;
853 struct evdev *evdev = client->evdev;
854 int retval;
855
856 retval = mutex_lock_interruptible(&evdev->mutex);
857 if (retval)
858 return retval;
859
860 if (!evdev->exist) {
861 retval = -ENODEV;
862 goto out;
863 }
864
865 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
866
867 out:
868 mutex_unlock(&evdev->mutex);
869 return retval;
870}
871
3a51f7c4
DT
872static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
873{
874 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
875}
41e979f8 876
3a51f7c4 877#ifdef CONFIG_COMPAT
6addb1d6
DT
878static long evdev_ioctl_compat(struct file *file,
879 unsigned int cmd, unsigned long arg)
52658bb6 880{
3a51f7c4 881 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
1da177e4 882}
52658bb6 883#endif
1da177e4 884
66e66118 885static const struct file_operations evdev_fops = {
6addb1d6
DT
886 .owner = THIS_MODULE,
887 .read = evdev_read,
888 .write = evdev_write,
889 .poll = evdev_poll,
890 .open = evdev_open,
891 .release = evdev_release,
892 .unlocked_ioctl = evdev_ioctl,
52658bb6 893#ifdef CONFIG_COMPAT
6addb1d6 894 .compat_ioctl = evdev_ioctl_compat,
52658bb6 895#endif
6addb1d6 896 .fasync = evdev_fasync,
6038f373
AB
897 .flush = evdev_flush,
898 .llseek = no_llseek,
1da177e4
LT
899};
900
6addb1d6
DT
901static int evdev_install_chrdev(struct evdev *evdev)
902{
903 /*
904 * No need to do any locking here as calls to connect and
905 * disconnect are serialized by the input core
906 */
907 evdev_table[evdev->minor] = evdev;
908 return 0;
909}
910
911static void evdev_remove_chrdev(struct evdev *evdev)
912{
913 /*
914 * Lock evdev table to prevent race with evdev_open()
915 */
916 mutex_lock(&evdev_table_mutex);
917 evdev_table[evdev->minor] = NULL;
918 mutex_unlock(&evdev_table_mutex);
919}
920
921/*
922 * Mark device non-existent. This disables writes, ioctls and
923 * prevents new users from opening the device. Already posted
924 * blocking reads will stay, however new ones will fail.
925 */
926static void evdev_mark_dead(struct evdev *evdev)
927{
928 mutex_lock(&evdev->mutex);
20da92de 929 evdev->exist = false;
6addb1d6
DT
930 mutex_unlock(&evdev->mutex);
931}
932
933static void evdev_cleanup(struct evdev *evdev)
934{
935 struct input_handle *handle = &evdev->handle;
936
937 evdev_mark_dead(evdev);
938 evdev_hangup(evdev);
939 evdev_remove_chrdev(evdev);
940
941 /* evdev is marked dead so no one else accesses evdev->open */
942 if (evdev->open) {
943 input_flush_device(handle, NULL);
944 input_close_device(handle);
945 }
946}
947
948/*
949 * Create new evdev device. Note that input core serializes calls
950 * to connect and disconnect so we don't need to lock evdev_table here.
951 */
5b2a0826
DT
952static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
953 const struct input_device_id *id)
1da177e4
LT
954{
955 struct evdev *evdev;
956 int minor;
5b2a0826 957 int error;
1da177e4 958
6addb1d6
DT
959 for (minor = 0; minor < EVDEV_MINORS; minor++)
960 if (!evdev_table[minor])
961 break;
962
1da177e4 963 if (minor == EVDEV_MINORS) {
da0c4901 964 pr_err("no more free evdev devices\n");
5b2a0826 965 return -ENFILE;
1da177e4
LT
966 }
967
5b2a0826
DT
968 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
969 if (!evdev)
970 return -ENOMEM;
1da177e4 971
d0ffb9be 972 INIT_LIST_HEAD(&evdev->client_list);
6addb1d6
DT
973 spin_lock_init(&evdev->client_lock);
974 mutex_init(&evdev->mutex);
1da177e4
LT
975 init_waitqueue_head(&evdev->wait);
976
3d5cb60e 977 dev_set_name(&evdev->dev, "event%d", minor);
20da92de 978 evdev->exist = true;
1da177e4 979 evdev->minor = minor;
6addb1d6 980
a7097ff8 981 evdev->handle.dev = input_get_device(dev);
3d5cb60e 982 evdev->handle.name = dev_name(&evdev->dev);
1da177e4
LT
983 evdev->handle.handler = handler;
984 evdev->handle.private = evdev;
1da177e4 985
6addb1d6 986 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
9657d75c
DT
987 evdev->dev.class = &input_class;
988 evdev->dev.parent = &dev->dev;
9657d75c
DT
989 evdev->dev.release = evdev_free;
990 device_initialize(&evdev->dev);
5b2a0826 991
6addb1d6 992 error = input_register_handle(&evdev->handle);
5b2a0826 993 if (error)
9657d75c 994 goto err_free_evdev;
5b2a0826 995
6addb1d6
DT
996 error = evdev_install_chrdev(evdev);
997 if (error)
998 goto err_unregister_handle;
999
1000 error = device_add(&evdev->dev);
5b2a0826 1001 if (error)
6addb1d6 1002 goto err_cleanup_evdev;
1da177e4 1003
5b2a0826 1004 return 0;
1da177e4 1005
6addb1d6
DT
1006 err_cleanup_evdev:
1007 evdev_cleanup(evdev);
1008 err_unregister_handle:
1009 input_unregister_handle(&evdev->handle);
5b2a0826 1010 err_free_evdev:
9657d75c 1011 put_device(&evdev->dev);
5b2a0826 1012 return error;
1da177e4
LT
1013}
1014
1015static void evdev_disconnect(struct input_handle *handle)
1016{
1017 struct evdev *evdev = handle->private;
1da177e4 1018
9657d75c 1019 device_del(&evdev->dev);
6addb1d6
DT
1020 evdev_cleanup(evdev);
1021 input_unregister_handle(handle);
9657d75c 1022 put_device(&evdev->dev);
1da177e4
LT
1023}
1024
66e66118 1025static const struct input_device_id evdev_ids[] = {
1da177e4
LT
1026 { .driver_info = 1 }, /* Matches all devices */
1027 { }, /* Terminating zero entry */
1028};
1029
1030MODULE_DEVICE_TABLE(input, evdev_ids);
1031
1032static struct input_handler evdev_handler = {
6addb1d6
DT
1033 .event = evdev_event,
1034 .connect = evdev_connect,
1035 .disconnect = evdev_disconnect,
1036 .fops = &evdev_fops,
1037 .minor = EVDEV_MINOR_BASE,
1038 .name = "evdev",
1039 .id_table = evdev_ids,
1da177e4
LT
1040};
1041
1042static int __init evdev_init(void)
1043{
4263cf0f 1044 return input_register_handler(&evdev_handler);
1da177e4
LT
1045}
1046
1047static void __exit evdev_exit(void)
1048{
1049 input_unregister_handler(&evdev_handler);
1050}
1051
1052module_init(evdev_init);
1053module_exit(evdev_exit);
1054
1055MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
1056MODULE_DESCRIPTION("Input driver event char devices");
1057MODULE_LICENSE("GPL");